A model for the structure of liquid Li4Pb

A. P. Copestake*, H. Ruppersberg, W. Schirmacher, Robert Evans

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

73 Citations (Scopus)

Abstract

The authors present the results of calculations of the partial structure factors and radial distribution functions of liquid Li4Pb at different temperatures. Assuming that this alloy is partially ionic, they have modelled the interionic forces by pairwise potentials that are strongly repulsive at small separations r and electronically screened Coulombic at large r. This model was motivated by the fact that an r-dependent ordering potential, which exhibits approximately screened Coulombic decay for larger r, can be extracted from the neutron diffraction data for SCC(q) in Li 4Pb. The calculations, which are based on the mean-spherical and the hyper-netted-chain approximations, show that the wavenumber dependence of the measured concentration structure factor SCC(q) can be reasonably well accounted for by the model with effective electron charges of about 0.5 and 4-2.0 at the Li and Pb sites, respectively, and an inverse screening length of 1.1 AA-1. These parameters are consistent with values obtained from the ordering potential extracted from experiment. In order to explain the observed temperature dependence of SCC(A) it is necessary to assume that the charge transfer between species decreases with increasing temperature.

Original languageEnglish
Article number011
Pages (from-to)1993-2010
Number of pages18
JournalJournal of Physics F: Metal Physics
Volume13
Issue number10
DOIs
Publication statusPublished - 1983

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    Copestake, A. P., Ruppersberg, H., Schirmacher, W., & Evans, R. (1983). A model for the structure of liquid Li4Pb. Journal of Physics F: Metal Physics, 13(10), 1993-2010. [011]. https://doi.org/10.1088/0305-4608/13/10/011